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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Please disregard the last message. The
problem was that they have added a line with a scanf() without popping the
return value off the stack. (Didn’t see that coming)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thank you everyone.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><strong><b><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Jorge Gonzalez</span></font></b></strong><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><br>
Control Systems Developer<br>
Automation Technology Products<br>
ATS Automation Tooling Systems Inc.<br>
Tel: (519) 653-6500 (x2721)<br>
</span></font><font color=navy><span style='color:navy'><a
href="http://www.atsautomation.com"><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>www.atsautomation.com</span></font></a></span></font><o:p></o:p></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
Slang-users-bounces@jedsoft.org [mailto:Slang-users-bounces@jedsoft.org] <b><span
style='font-weight:bold'>On Behalf Of </span></b><st1:PersonName w:st="on">Gonzalez,
Jorge</st1:PersonName><br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, November 24, 2005
2:27 PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">Slang-users@jedsoft.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Cc:</span></b> <st1:PersonName w:st="on">Galea,
Peter</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> [slang-users] A stack
overflow problem using slang 1.4.5</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi guys,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Sorry to bother you, but I have a problem which requires a
little expert advise.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>We are using slang-1.4.5 on QNX4 on one of our machines at a
customer site; and about twice a day the machine stops because of a slang error
that shows up like this: <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-indent:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>S-Lang Error: Stack Overflow: Error
while executing ConvertLot2 Cell 4 - ATS Scripting Driver<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-indent:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>S-Lang Error: Stack Overflow:
qd::exec unable to execute <ConvertLot2> Cell 4 - ATS
Scripting Driver<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-indent:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>S-Lang Error: Stack
Overflow Cell 4 - ATS Scripting Driver<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-indent:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>S-Lang Error: Stack Overflow: Error
while executing ConvertLot1 Cell 4 - ATS Scripting Driver<o:p></o:p></span></font></p>
<p class=MsoNormal><strong><b><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>Which clearly indicates that we
are leaking stack memory somewhere. The thing is that this happens so
sporadicaly that we cannot figure out what is causing it.<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'><o:p> </o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>For this application we have
created some intrinsic functions to pass data to/from slang and the rest of the
controller engine; these are of the form get_DINT(), set_DINT(), etc. Those
functions have been thoroghly tested and I don’t think are the source of
the problem. Here is the function we are calling where this error is happening:<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'><o:p> </o:p></span></font></b></strong></p>
<p class=MsoNormal style='text-indent:.5in'><strong><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:normal'>define
ConvertLot2()<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal style='text-indent:.5in'><strong><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:normal'>{<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>
% These
datawords contain the ASCII characters of the serial number in reverse byte
order<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>
variable
DW1=get_DINT("LotNumber2[0]");<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>
variable
DW2=get_DINT("LotNumber2[1]");<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>
variable
DW3=get_DINT("LotNumber2[2]");<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>
variable
DW4=get_DINT("LotNumber2[3]");<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>
variable
DW5=get_DINT("LotNumber2[4]");<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>
variable
DW6=get_DINT("LotNumber2[5]");<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>
variable
DW7=get_DINT("LotNumber2[6]");<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>
variable
DW8=get_DINT("LotNumber2[7]");<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>
variable
DW9=get_DINT("LotNumber2[8]");<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>
variable
DW10=get_DINT("LotNumber2[9]");<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'><o:p> </o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>
variable
lotString="0";<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'><o:p> </o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>
</span></font></b></strong><strong><b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>lotString=pack("KKKKKKKKKK",DW1,DW2,DW3,DW4,DW5,DW6,DW7,DW8,DW9,DW10);<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>
<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>
% Transfer
the string data to placeholder variable in the MACS user dataspace.<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>
set_STRING("LotNumberString[1]",lotString);<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal style='text-indent:.5in'><strong><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:normal'>}<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>So my question here is: Is there
any record of the </span></font></b></strong><strong><b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>pack()</span></font></b></strong><strong><b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial;font-weight:
normal'> function leaking stack memory for version 1.4.5 or earlier?<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'><o:p> </o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>I looked in the changes.txt files
for this and later versions and it doesn’t seem to be any reference of
the pack() function leaking stack memory; and I am not saying that this is
happennig, but I just need to rule out the possibility.<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'><o:p> </o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>BTW: I used the _stkdepth() slang
function at the end of this ConvertLot2() function to check to see whether the
stack was getting polluted but so far is looking fine.(??)<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'><o:p> </o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>Any advise or suggestions on how
to debug this are most welcome.<o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'><o:p> </o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial;font-weight:normal'>Thanks,</span></font></b></strong><strong><b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></b></strong></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Jorge Gonzalez</span></font></b></strong><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><br>
Control Systems Developer<br>
Automation Technology Products<br>
ATS Automation Tooling Systems Inc.<br>
Tel: (519) 653-6500 (x2721)<br>
</span></font><a href="http://www.atsautomation.com"><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>www.atsautomation.com</span></font></a><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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